We recently had it servived due to it failing to ignite, the engineer replaced a circuit board and got it running again.

We ran the central heating for a few hours, and all seemed fine, all the radiators were working. Then turned the central heating off before we went to bed. However, the following morning the boiler pressure had dropped to zero.

This has happened several times now, and i'm just curious as to what is causing it, and if it will damage the boiler in the long run. The problem is easily rectified by topping the boiler back up to just above one bar pressure, it runs fine when we do this, and doesnt lose any pressure while its operating. Its only the following morning the pressure has dropped to zero.

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